Citizen Eco-Drive Promaster Professional Diver is used for mixed gas diving with its 6mm non-reflective curved crystal, ratcheted elapsed-time bezel, screw-back case & screw-down crown, and reinforced urethane band and extender, with a carrying case for the wetsuit strap extension. Crafted in stainless steel with luminous accents, and 300M WR. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number B873. Specifications - Model: BJ8050-08E - Dial: Black Luminous Hands and Markers - Case: 48 mm Silver-Tone Stainless Steel Promaster Crown One-Way Rotating Elapsed-Time Bezel - Lug: 29 mm - Band: Strap Polyurethane Buckle - Crystal: Anti-Reflective Mineral Crystal Impact and shatter resistant - anti-reflective coating deflects light - Water-Resistance: 300M/30Bar (Swimming, Marine Sports, Scuba Diving) - Weight (g): 180 - Movement: B873 Eco-Drive Powered by any light source, continuously and sustainably, eliminating the need to replace watch batteries. - Functions: 3-Hand Date Item # BJ8050-08E Note: Price excludes center diamond. Final cost may vary with customization and metal choice. For more information, assistance, sizing and customization, please contact us at (757) 548-1258 or visit our site to know more. https://tidewaterdiamond.com #BestRingEver #TidewaterDiamond